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C. R. vRATHBUN 8a F. W. ADAMS. Sand-Paper R011 for Boots and Shoes Patented Mar. 30,1880.

T'lEEEEE* UNITED STATES PATENT OFFICE.,

CHARLES R. RATI-IBUN AND FREDERICK W. ADAMS, OF WORCESTER, MASS.

SAND-PAPER ROLL FOR BOOTS` AND SHOES.

SPECIFICATION forming' part of Letters Patent No. 226,104, dated March 30, 1880,

Application filed October 25, 1879.

To all whom it may concern;

Be it known 4that we, CHARLES R. RATH- BUN and FREDERICK W. ADAMS, both of the city and county of Vorcester, and State of Massachusetts, have invented certain new and useful Improvements in Sand-Paper Rolls or Theels for Polishing the Bottoms of Boots and Shoes; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanyin g drawings, forming a part of this specication, and in which- Fi ,Qure l represents a top or plan view of one of our aforesaid improved sand-paper rolls, the feltin g and sand-paper employed upon said roll bein g left oii.' for the purpose of illustrating the parts lnore clearly. Fig. 2 represents an end view ot' the roll shown by Fig. 1, looking in the direction indicated by arrow l of said ure. Fig. 3 represents, upon an enlarged scale, a cross or transverse section through the roll, taken on line A B, Fig. 1, looking in the direction indicated by arrow l of the same tigure, the sand paper and felting in this instance being shown drawn over the roll ready for use. Fig. 4 represents a transverse section, the same as Fig. 3, with the exception that the sand-paper and felting are left oi' and the clamping-jaws thrown up and opened, as will be hereinafter more fully described. Fig. 5 represents a transverse section throughthe roll, taken on line C D, Fig. 1, looking in the direction of arrow l of said figure, showing a section through the spring by means of which the clamping-jaws are thrown open, as will be hereinafter more fully set forth; and Fig. 6 represents a side view of the clamping-jaws and their spring, alluded to in description of Fig. 5.

The nature of our invention consists in improvements in the combination of mechanism for securing sand-paper and other similar polishing materials upon wheels or rolls for polishing purposes, and is an improvement upon the sand-paper roll or wheel for which Letters Patent No. 202,119 of the United States were granted to us April 9, 1878.

By our present invention of arranging, constructing, and operating the clampingjaws and their operating parts, as hereinafter described, the operation of tightly drawing the sandpaper (which we will suppose it to be in this instance) about the roll, and there securing it in position, is greatly simplified, while at the same time, by such construction, as aforesaid, the clampingjaws are enabled to adjust themselves to any thickness of sandpaper placed between them.

To enable those skilled in the art to which our invention belongs to make and use the same, we will proceed to describe it more in detail.

In the drawing, the part marked D represents the sand-paper roll or cylinder, in which the clamping device is arranged and secured. Said roll is arranged to turn with shaft E, upon which it is secured, and is oper ated by means of a driving-pulley, F, over which a belt may be passed connected with any suitable and convenient driving mechanism.

G G represent the clamping-jaws of the device, which are tted loosely in roll D, but are prevented from moving out of their proper positions laterally by bearing upon one side against the side H of roll D, and upon the other side by bearing against a cam-shaft, l. They are held in position longitudinally and vertically by cogs J K, formed or secured upon cam-shaft I, and upon which they are supported, each jaw G G being provided with openings L L, for the reception of said cogs.

Cogs J K not only serve the purpose of holding` the jaws in position longitudinally and vertically, but when rotated by turning camshaft I, as hereinafter described, also serve to raise or lower said jaws according to which direction the cam-shaft is turned. Supposing the jaws to be in their lowest position, as represented in Figs. 3 and 5 of the drawings, by now turning the camshaft I to the right the cogs are raised into the position represented in Fig. 4, thereby also raising the jaws, which are thrown apart or opened when so raised by a spring, M, secured to the lower part ofjaw G, pressing against jaw G', an opening, N, being formed in jaw G for the passage of the upper end of said spring, as is fully represented in Figs. 5 and 6 of the drawings.

To allow of jaw G being sprung out by spring N, as above described, the side of camshaft I is cut out, as represented at O, for that purpose.

When the jaws are in their most elevated IOO position, as is represented in Fig. 4, it will be seen thatonly one of the jaws, G', is supported upon cogs J K, therefore necessitating the support of said jaw G upon jaw G'. To accomplish this a portion, G2, of the lower part of said jaw G is bent at right angles to the jaw, being cut at the points a a for that purpose, and said bent portion passed through a slot or opening formed in the lower' part of jaw G', thereby supporting and giving the same action to the former as the latter by cogs J K.

As will be observed by referring to Figs. 3, 4, and 5, jaw G' is curved slightly toward the cam-shaft I, the purpose of which is to give a springing motion to said jaw, so that it will adjust itself' to any thickness of sand-paper when forced toward the other jaw, G, by camshaft I, which latter is so arranged and eonstructed in relation to the jaws G G' that when it is turned so as to bring its circular surface (which acts as a cam) against curved jaw G' the latter will be sprung just suflicient to properly hold the sand-paper when of ordinary thickness. Then it is ot' more than ordinary thickness it will naturally be clamped very tightly, but not sufficiently to impair the action of the device.

The cam-shaft I is arranged to turn in an adjustable holding-piece, I), which is secured by means of screws b and c to roll I), and forms a part thereof. It may be removed when desired to adjust or repair any of the parts of the clampingdevice bysimply removing screws b and c.

The cam-shaft is prevented from moving out of position longitudinally by having a groove, d, formed around one of its ends, into which tits screw b,- anda friction is also produced upon said shaft, to prevent its turning too easily, by the end P' of adjustable holding-piece I) being sawed into or split, so that when screw e is turned down it will be pinched or clutched about the end of the shaft, thereby holding the latter so that it will not easily turn and allow its cogs to swing down and thejaws to drop when elevated and sprung open, as represented in Fig. 4. j

When the cogs are swung up, as above described, their sides c bear against the adjustable holding-piece P at the point f.

Although but two cogs, J K, are herein described, and shown in the drawings, any desired number similarin form and construction. may be employed for throwing up the jaws, a corresponding number of openings, L, also being formed in said jaws for the reception of the same.

Two or more springs, M, and openings N may also be employed, if preferred, and the jaws J K, instead of consisting of two separate plates, G G', suspended one upon the other, as before described, may be made in one piece by doubling the same together without departing from the principle of our invention.

Said invent-ion may be applied to a wheel for polishing, instead of roll D, with equal facility and as good results by simply shortening the cam-shaft, &c., and employing only one cog, J or K, for supporting and operating the clamping-jaws.

The operation of securing the felting Q, and sandpaper It (represented in Fig. 3) upon the roll ready for polishing purposes may be briefly summed up as follows: Adjustable piece P having been removed and the felting cut of the proper forln to fit tightly over the roll when drawn about the same, said felting is then fastened at one side to the roll proper by means of wire or thread passed through openings g, and to the adjustable piece I) by means of holes 7i, when said adjustable piece I)I is then inserted and secured in position in its slot formed in roll l) by means of screws I) and c, as before explained, when the jaws G G' are then thrown up, as also before explained, and shown in Fig. 4, thus preparing the roll to receive the sand-paper, which is now placed over the same with the sides k 7s between the upper ends ofjaws G G'. rIhe cam-shaft I is now turned to the left by applying a key or wrench to its square end I', which causes the jaws to be drawn down by means of cogs J K, as before stated, thereby tightly drawing and securely holding the sand paper R in position about the roll ready for polishing purposes.

rlhe piece of sand-paper t is cut ot'j ust sufficient size to fit over the roll lengthwise and to allow of about one-eighth of an inch of each side being inserted between the clain1')ii1gja\vs G G'.

Ihus it will be seen that but litt-le material is wasted; and from the foregoing-described arrangement and construction of the several parts of the device it will also be seen that owing to their simplicity they are not liable to be broken orto otherwise get out of repair; and by making the roll solid, as shown in the drawings, instead of in shell form. as is usually the case, it is entirely prevented from springing when in operation, thus obviating a great objection in rolls now in public use.

lIavin g described ourimprovements in sandpaper rolls or wheels, what we claim therein as new and of our invention, and desire to set cure by Letters Patent, is

The combination, with roll I), adjustable holding piece I), and cam shaft I, provided with one or more cogs, J K, of clamping-jaws G G' and spring M, arranged, constructed, and combined together, substantially as and for the purposes set forth.

CHARLES R. AIHBUN. F EDERIOK W. ADAMS.

'fVitnesses HENRY (l. '\\A'1LLsoN, ALBERT A. BARKER. 

